Magnetic actuators - anyone here ever made one?

Magnetostrictive alloys like Galfenol are not only quite cheap but also quite possible to produce and machine at home.
As it seems that right now I can't finnish anything without being stopped by something else that got my attention I am a bit stuch on all ends now LOL
Anyway, I still have a few kg of rare elements like Gallium, Bismuth, Antimony and such that I misused for my testing of home made ferrites.
So apart from making some fancy metals that melt at very low temperatures I thought a much better test usage would be to make something that for once has some real world use :)
If you look up some of the research papers for Galfenol use or magnetostrictive materials in general you soon learn two things:
a) You need a degree or have studied something related to fully understand the technical stuff behind it.
b) Finding something that would give you enough info to make something that works as planned is next to impossible.
I don't mind wasting some time on melting steel, machining some samples and do some testing but of course this takes a lot of time...
So I was wondering if anyone here already experimented with magnetostrictive materials and their possible uses?
Apart from micro actuators for minature things I don't have I was thinking of generator use.
A lot of things produce wanted and unwanted vibrations, magnetostrictive alloys are capable of transforming them into electrical energy by simply using a coil around the material.
For example the recoil of your favourite hunting rifle could in theory charge your dot sight or laser sight/flashlight.
Or the otherwise useless vibrations of big machines or rock tumblers can be turned into something to charge your phone.
Not to mention impact sensors or flat surface loudspeakers....